Used 135mm f1.8

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englishman
englishman Senior Member • Posts: 1,014
Used 135mm f1.8

Got this lens today ... focus is silent at 1.8 and 2.0 but at smaller apertures the focus starts to be audible. It’s quick and accurate, but is this normal?

Also, with more experimentation, the focus is silent at all apertures when on AF-C (I have A7iii), but the “zzzt” sound returns when on AF-S. 
The more I stop down, the louder the “zzzt”

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